Instrument for plotting maps from photographs



G. HESS April 30, 1935.

INSTRUMENT FOR PLOT'I'ING MAPS FROM PHOTOGRAPHS Fil'ed Sept. 29, 1934 ln venfor'l' Patented Apr. 30, 1935 UNITED stares INSTRUMENT FOR PLOTTING MAPS PHOTOGRAEEI more;

Gustav Hess, Jena, Germany, assignor to firm oi Carl Zeiss, Jena, Germany Application September 29, 193i, Serial No. Marco In Germany October 10, 11933 teams. (on. ss-ao) I have filed an application in Germany, October 10, 1933.

The invention concerns an instrument to be used together with a reflecting stereoscope and adapted to plot maps from stereoscopical photographs, especially vertical photographs, taken from aircraft, the instrument being provided to this eflect with the two elements of a stereoscopical mark, which are atfiustable relatively to each my other in the direction of their line of interconnection and coordinated to a plotting pencil disposed between the holders carrying them.

. According to the invention, an instrument oi this kind is especially handy and easily trans-.

portable when it may move freely, that is to say without any guides, relatively to the table supporting the plotting paper and the stereoscopical photographs.

The measuring elements are suitably disposed on transparent plates, for instance glass plates, and, in the measuring process, at least those parts of the plates which are provided with the measuring elements are to lie near the photographs.

These transparent plates are conveniently por-= tions of spherical bodies having the measuring elements at their bottom, and it is advisable to so mount each plate on a holder that it is rotatable relatively to this holder about an axis parallel to the line interconnecting the two measuring elements.

the invention and represents a constructional example of an instrument for plotting maps from photographs, Figures 1 and 2 show the instrument in part-sectional elevation and in top view, respectively.

The instrument according to the drawing has two supporting bodies a and 013 which are to lie on the photographs b and b respectively. The photographs 22 and b represent a steroscoplc photograph of a landscape. The supporting body a is connected to a rod 0. This rod 0 is so disposed in a sleeve e' fixed to the other supporting body a by means of a screw d as to be adjustable in the direction of its axis X--X. Approximately in the middle between the two supporting bodies a and a, the said rod c is provided with a plotting pencil i cooperating with a plotting surface i To the rod e is connected a threaded spindle g which meshes with a nut i rotatably mounted in the sleeve e. A pin t screwed into the sleeve 2 extends into an annular in the accompanying drawing, which illustrates by the edge e of the sleeve e on the scale e of the rod c. The' fine indication is efiected by means of an index e on the sleeve e and a scale it on the nut h. On the supporting bodies a} and a are. mounted portions sphericalglass bodies k and k respectively, which are rotatable about an axis YY parallel to the axis X-X oi the rod 0. The bottoms of these glass bodies k and More provided with measuring elementsl and Z respectively, and lie on the photographs b and b m respectively. As is illustrated in the drawing, it is advisable to provide that the line intercom necting the two measuring elements Z and E parallel to the axis X--X oi the rod 0.

I claim: Y a

l. Aim.- instrument to be used together with a reflecting stereoscope and adapted to plot maps from stereoscopical photographs, especially vertical photographs, taken from aircraft, these two photographs lying near each other on a table and having a plotting paper between them, the said instrument having two holding bodies and a' straight guide along which these two holding bodiesare adjustable relatively to each other, the two holding bodies having a. surface that is 25 parallel to the straight guide and upon which the two holding bodies rest on the table, the two holding bodies being adapted to be freely displaced together with the said straight guide with out the necessity of guides, each of the two holding bodies having one element of a stereoscopical mark, these two elements lying in the measuring process on the photographs and being so post tioned relatively to each other that their line of interconnection is parallel to the'said straight guide, and a plotting pencil disposed on this straight guide.

2. An instrument to be used together with a reflecting stereoscope and adapted to plot maps from stereoscopical photographs, especially ver tidal photographs, taken from. aircraft, these two photographs lying near each other on a table and having a plotting paper between them, the said instrument having two holding bodies and a straight guide along which these two holding bodies are adjustable relatively to each other, the two holding bodies having a surface that is parallel to the straight guide and upon which the two holding bodies rest on the table, the two holding bodies being adapted to be freely displaced together with the said straight guide without the necessity of guides, each of the two hold= ing bodies having a transparent plate at least part of which lies during the measuring process on the appertaining photograph, each oi these two parts being provided with one of the said elements, these two elements being so positioned relatively to each other that their line of interconnection is parallel to the said straight guide, and a plotting pencil disposed on this straight guide.

3. An instrument to be used together with a reflecting stereoscope and adapted to plot maps from stereoscopical photographs, especially vertical photographs, taken from aircraft, these two photographs lying near each other on a table and having a. plotting paper between them, the said instrument having two holding bodies and a straight guide along which these two holding bodies are adjustable relatively to each other, the two holding bodies having a surface that is parallel to' the straight guide and upon which the two holding bodies'rest on the table, the two holding bodies being adapted to be freely displaced together with the said straight guide without the necessity of guides, each of the two holding bodies having a transparent portion of aspherical body whose bottom lies during the measuring process on the appertaining photograph, one element of a stereoscopical mark being provided in the bottom of each body, these two bodies having during the measuring process such a position relatively to each other that the line interconnecting the said two elements is parallel tothe said straight guide, and a plotting pencil disposed on the said straight guide.

4. An instrument to be used together with a reflecting stereoscope and adapted to plot maps from stereoscopical photographs, especially vertical photographs, taken from aircraft, these two photographs lying near each other on a table and having a plotting paper between them, the said instrument having two holding bodies and a straight guide along which these two holding bodies are adjustable relatively to each other, the two holding bodies having a surface that is parallel to the straight guide and upon which the two holding bodies rest on the table, the two holding bodies being adapted to be freely displaced together with the said straight guide without the necessity of guides, a transparent portion of a spherical body being so disposed on each of the said holding bodies as to be rotatable about an axis parallel to the said straight guide, the bottom of each of the said two bodies lying during the measuring process on the appertaining photograph, one element of a stereoscopical mark being provided in the bottom'of each body, these two bodies having during the measuring process such a position relatively to each other that the line interconnecting the said two elements is parallel. 

